Stair family with multiple variations formula

[J450NP13]

I am modeling a set of stairs with steps going up to a porch at first floor height.  I want to make the porches height parametric and the steps to change with the height of the porch.

Everything is working....but I cannot figure out how to use the formula to make the first two steps visibility on or off when the porch is lower and only needs one step.

[L.Maas]

If you can post what you have up to now we can have a look what is possible.

[J450NP13]

Here is the family.  This is only a test for workflow purposes.

[L.Maas]

Just a possible solution

If you need to build in possibility of (many) more steps I probably would start to look at a nested whereby you control the stairs section in the nested component.

[J450NP13]

I can't seem to understand your logic behind the code you're writing.    I am pretty quick when it comes to understanding programming...but I'm not getting it.

[L.Maas]

Basically what I am doing is the following:

-Determine the amount of steps needed. Below or equal to 0' 6" 0 steps, Higher than 0' 6" 1 step, Higher than 1' 1" 2 steps, Higher than 1' 8" 3 steps

-When the foundation height gets below 1' 8" I hide step 1 and lower step 2 from 1' 2" to 0' 7" and step 3 from 1' 7" to 1' 2".

-When the foundation height gets below 1' 1" I hide step 1 and step 2 and lower step 3 to 0' 7".

See attached example

[J450NP13]

Ok, I understand that.

What is the "Steps Needed" Parameter?

[L.Maas]

I use that as an intermediary step to calculate if I need 1, 2 or 3 steps, based on the foundation height.

You could incorpotate this calculation in the the Visble_Step1, Visble_Step2 and Visble_Step3 formulas

[J450NP13]

I understand now.

Isn't there a way I can just create a formula that if I select that specific family in the name box that it just automatically hides those steps by putting that formula in their formula boxes?  Instead of depending on the height of the foundation?

[J450NP13]

What is the "Steps Needed" parameter type?  An int?  What is the parameter grouped under?

[L.Maas]

You can check it easily.

It is an integer. It is grouped under Other. You can edit it and group it under another category if you like (e.g. constraints).

[J450NP13]

Ok, I am getting it.  I see how Steps Needed you're declareing what it is.

But I am not getting the formula in the dimensions for the steps.

[L.Maas · Accepted solution]

The Step 2 Rise formula:

-If "Visble_Step1 "is visble (i.e. is true, thus has a checkmark) then the height of this step should be 0' 11" otherwise it should be 0' 7"

-Because we hide step 1, step 2 becomes th first step and should be lower

-When step 1 is visble (at 0 '7")  step 2 must be higher, thus 0'11" 

The Step 3 Rise formula:

-If "Visble_Step1" is visible/true then the height of this third step should be 1' 7".  (We have three steps)

 If "Visble Step 2" is visible/true but not "Visble_Step1" then third step should be 1' 2" (We have two steps)

 If not than third step should be 0' 7" (We have zero or one step) 

-The if statement stops when a true statement is observed.

-When "Visble_Step1" is visible/true then automatically step 2 is also visible/true thus step 3 must be highest at 1' 7"

-When Step 1 is not visble/false then revit goes to check next statement. If step 2 is visible (step 1 was already checked not to be visible) thus we have two steps thus Step 3 must be 1' 2" .

-When Step 1 and Step 2 are not visble then we only have step 3 left and it  shall be 0' 7" (If it is even lower than also this step will be hidden)

Try to experiment with the family and see what it does and how it works.

[J450NP13]

Thank you.

I see how the syntax is now...I really appreciate it.

[J450NP13]

Louis,

When I do that it has an issue with constriants and then wants to delete the extrusions.

[L.Maas]

A few posts back I uploaded a modified version of the stairs (Stairs_test2.rfa). Did you have a look at that one?

[J450NP13]

I'm in 2015

[L.Maas]

Do not have 2015 available at the moment.

Upload your family with what you have got so far and I will have a look

[J450NP13]

Here is what I have.

[L.Maas]

Strange. I opened your family (in Revit 2017) and added the two formulas for "Step 2 RISE" and "Step 3 RISE" as in the screenshot.

I get no errors.

What do you do to get those errors?